Discharge valve



Feb. 29, 1944. R gAWoOD 2,343,134-

' DISCHARGE VALVE Filed May 4, 1943 %0 Ti. J.

.252 venizar RICHARD L. CAWOOD 3y hr: aiiarweya min-W2,

Patented Feb. 29, 1944 DISCHARGE VALVE Richard L. Cawood, East Liverpool, Ohio, assignor to The Patterson Foundry & Machine Company, East Liverpool, Ohio, a corporation of Ohio Application May 4, 1943, Serial No. 485,638

2 Claims.

This invention relates to discharge valve and more particularly to discharge valves adapted to control the discharge port of receptacles of various kinds as pebble mills, process kettles and chemical and process apparatus, and it is an object of this inveniton to provide a discharge valve of the type described of improved construction and of greater ease and reliability of operation. It is also an object of this invention to provide a discharge valve of such construction that leakage of the contents of the receptacle is prevented and the rendering of the operation of the valve difflcult is avoided and it is a further object of this invention to provide a discharge valve structure which permits of the valve being readily dismantled for cleaning and which is of a simple and rugged construction unlikely to be broken or damaged in service.

In the drawing which illustrates a preferred construction,

Fig. l is a sectional view of a valve in accordance with this invention, the valve being shown attached to a. receptacle casing and in the open position; and

Fig. 2 is a view similar to Fig. 1, the valve being shown in the closed position.

In the drawing, a valve in accordance with this invention is shown in connection with a portion of a receptacle having a shell or casing I and a suitable lining 2, both of which are cut away to provide a discharge opening in which is fitted a tubular bushing 4 having a circular flange B which is secured to the outer face of the casing l by rivets or other suitable attaching means (not shown). To the flange 6, bolts 1 secure the circular flange 8 of a valve casing comprising a tubular portion Ill which extends upwardl (as shown in the drawing) from the flange 8 and closely fits the bushing 4 and a second tubular portion 12. of less internal diameter than the tubular portion H], which extends downwardly from the flange 8, the upper end of the tubular portion 12 being cut away to provide a tapered or inclined valve seat. as at it.

Mounted for reciprocation on the valve casin is a valve body having a tapered valve portion l6 adapted to cooperate with the valve seat H in controlling the fiow through the valve casing, a tubular stern portion is extending from the valve portion l and of greater length than the tubular F casing portion l2 in which it is fitted, and a disk portion which fits the tubular casing portion l0 and is joined to the valve portion l6 by a tapering neck portion 22. The disk portion 20 is provided with a ported skirt or flange 24 which extends into the tubular casing portion Ill at all times and prevents discharge of solid matter when the valve is open. The tubular stem l8 has openings at its upper end adjacent the valve IE to provide a passage from the interior of the tubular portion ill to the interior of the tubular stem l8 when the valve i6 is open. The stem 18 is also threaded at its lower or free end both internally and externally, the internal thread 25 being for the attachment of a hose or other suitable connection (not shown) for conducting away the material discharged by the valve. The external thread 26 is engaged by a correspondingly threaded wheel nut 28 which serves to operate the valve and is held seated against the lower edge of the tubular casing portion I2 by a split ring 3!] seoured to a rib or boss 32 on the wheel nut 28 by bolts 34, the ring 30 being split between bolts 34. The ring 30 projects inwardly beyond the rib 32 sufliciently to engage in a groove 36 formed in the outer face of the tubular casing portion I2. The wheel nut 28 being held against all movement except rotation, rotation of the wheel nut will serve to raise or lower the valve body, the valve body being held against rotation by a pin 38 inserted in a threaded opening in the tubular Casing portion l2 and engaging in a groove 40 extending longitudinally of the tubular stem I8 in the outer face thereof. The pin 38 is hidden by the wheel nut 28 when the device is completely assembled.

In use, the wheel nut 28 is rotated in one direction to raise the valve body from th closed position of Fig. 2 to the open position of Fig. 1 in which the material to be discharged from the mill can pass through the ports of the flange 24 to the interior of the tubular casing portion Ill and then through the ports in the tubular stem 18 to the interior of the stem I8 and the hose connected to lower end of the stem. Rotation of the wheel nut in the opposite direction returns the valve body from the open to the closed position in which the flow past the valve portion I6 is out ofi. Repeated operation of the valve body between the open and closed positions tends to work or carry the material being discharged from the mill down between the tubular casing portion I2 and the stem IB until it is eventually carried onto the thread and interferes with the free and rapid operation of the valve body by the wheel nut 28. In order to prevent such interference with the valve operation, a tapering groove extending around the tubular stem I8 is cut in the outer face of the stem above the thread 26 but a sumcient distance below the ports in the stem that the groove is not exposed when the valve is fully opened. In this groove is placed a suitable tapered packing 42 and a tapered split packing ring 44, the ring and packing being so arranged that pressure on the packing ring 44 tends to force the packing 42 out of the groove. To apply pressure on the ring 44, the tubular stem I8 is provided with a plurality of threaded openings, uniformly spaced about the stem and extending from the free end of the stem I8 to the groove in which the ring 44 and packing 42 are placed. Adjusting screws 46 threaded into these openings and bearing on the packing ring 44 are accessible at all times for adjustment to bring the necessary pressure to bear upon the ring 44 to keep the packing 42 hearing against the tubular casing portion l 8 with suflicient pressure to prevent leakage past the packing of both fluid or volatile material.

With the material discharged by the valve, excluded from the thread of the wheel nut 28, proper lubrication of the threads of the wheel nut and valve stem is not interfered with and in order to provide the necessary lubrication, a lubricant passage 48 extending from the upper surface of the wheel nut to a face in contact with the thread on the valve stem is is formed in the wheel nut. Preferabl extending from the passage 48 is a branch passage 50 opening on the surface of the hand wheel where it is in contact with the lower end of the tubular portion It To insure the proper lubrication a fitting 52 is applied to the outer end of the passage 48 permitting of the application of a lubricant under pressure.

Iclaim:

l. A valve fitting comprisin a casing shaped to provide a valve seat and a tubular extension at one side thereof, a valve fitted to said seat and adapted to form a seal therewith, a tubular threaded stem for said valve fitting said tubular extension and having an end projecting from said extension, said stem having openings for the passage of fluid from said valve and a groove encircling said stern, packing means in said groove for preventing leakage along said stem, means for applying pressure to said packing means to hold said packing means engaged with said tubular stem, said pressure applying means being accessible at the projecting end of said stem, and a nut engaging said threaded stem for operating said valve.

2. A valve fitting comprising a casing shaped to provide a valve seat and a tubular extension at one side thereof, a valve fitted to said seat and adapted to form a seal therewith, a tubular threaded stem for said valve fittin said tubular extension and having an end projecting from said extension, said stem having openings for the passage of fluid from said valve and a tapered groove encircling said stem, packin means in said groove for preventing leakage along said stem, screws threaded into said stem for applying pressure to said packing means, said screws being accessible at the projecting end of said stem, and a nut engaging said threaded stem for operating said valve.

RICHARD L. CAWOOD. 

